Remove TransparentActivateWindowButton from Overview Mode

ash/wm/overview/window_grid.h

Index: ash/wm/overview/window_grid.h
diff --git a/ash/wm/overview/window_grid.h b/ash/wm/overview/window_grid.h
index 349c36675aa69d6195ce0f3e6d83dd25278b6e34..763136f95f0f645d457e171ee716d5e0f08527d4 100644
--- a/ash/wm/overview/window_grid.h
+++ b/ash/wm/overview/window_grid.h
@@ -15,6 +15,7 @@
 
 namespace aura {
 class Window;
+class ScopedWindowTargeter;
 }
 
 namespace views {
@@ -45,7 +46,8 @@ class WindowSelectorItem;
 //    0, 3, 6, 1, 4, 2, 5
 // The selector is switched to the next window grid (if available) or wrapped if
 // it reaches the end of its movement sequence.
-class ASH_EXPORT WindowGrid : public aura::WindowObserver {
+class ASH_EXPORT WindowGrid : public aura::WindowObserver,
+                              public ui::EventHandler {
  public:
   WindowGrid(aura::Window* root_window,
              const std::vector<aura::Window*>& window_list,
@@ -100,6 +102,11 @@ class ASH_EXPORT WindowGrid : public aura::WindowObserver {
                              const gfx::Rect& old_bounds,
                              const gfx::Rect& new_bounds) override;
 
+  // ui::EventHandler:
+  void OnMouseEvent(ui::MouseEvent* mouse) override;
+
+  void OnGestureEvent(ui::GestureEvent* gesture) override;
+
  private:
   friend class WindowSelectorTest;
 
@@ -112,6 +119,13 @@ class ASH_EXPORT WindowGrid : public aura::WindowObserver {
                            bool out_of_bounds,
                            bool animate);
 
+  // Handles taps and clicks.
+  void HandleTap(ui::LocatedEvent* event) const;
+
+  // Returns the window at which the event is located.
+  aura::Window* GetWindowAt(ui::LocatedEvent* event,
+                            aura::Window* container) const;
+
   // Moves the selection widget to the targeted window.
   void MoveSelectionWidgetToTarget(bool animate);
 
@@ -139,6 +153,12 @@ class ASH_EXPORT WindowGrid : public aura::WindowObserver {
   // Number of columns in the grid.
   size_t num_columns_;
 
+  // The container where the static targeter is set.
+  aura::Window* static_targeter_container_;
+
+  // Holds and restores the panel container's targeter.
+  scoped_ptr<aura::ScopedWindowTargeter> scoped_panel_targeter_;
+
   DISALLOW_COPY_AND_ASSIGN(WindowGrid);
 };